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The previously listed total of 179 does not appear to be correct for SQL:2016 anymore. (Previous SQL versions had slightly different feature sets, so it's plausible that it was once correct.) The currently correct count is the number of rows in the respective tables in appendix F in SQL parts 2 and 11, minus 2 features that are listed twice. Thus the correct count is currently 177. This also matches the number of Core entries the built documentation currently shows, so it's internally consistent.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.